Editing elliptical arc segments in paths

Hi All,

I wrote a new feature for inkscape a while ago (3 years ago) but never got
it upstreamed, partly because it had some obvious bugs.

Recently I wanted to use this feature again so decided to fix the code and
bring it up to date with the latest code base.

I have now fixed the bugs I found previously. The code is much closer to a
state where it could be upstreamed, but likely it will need some tweaks for
usability.

The most notable differences are;
 - Arc segments now get a pair of handles at right angles to each other, to
manipulate
     the two radii of the ellipse and the rotation of the ellipse.
 - Arc segments are no longer automatically converted to beziers upon
editing a path
 - Arc segments can be converted to beziers using the "make segments
smooth" button
 - Dragging the line of an arc segment will not manipulate the segment like
it will if the segment
     is a line or a bezier (and therefore not all segments can be dragged,
whereas they could
     before) (maybe a different behaviour is desired here)
 - The arc flags (the large flag and sweep flag) can be set using new
buttons in the node toolbar

I'm still a new contributor, so let me know what I should do next. I guess
I need to create a merge request on gitlab?

Thanks.
Dan.

(Currently the code is here:
https://gitlab.com/danieljabailey/inkscape/tree/danieljabailey_arc_node_editor
)

(Previous discussion can be found in the messages from 2016 in these search
results:
https://sourceforge.net/p/inkscape/mailman/search/?q=Arcs+in+the+path+editor&mail_list=inkscape-devel
)

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